Question

Mathematics are my favourite subject.spot the errors

Answer 1

mathematics is my favorite subject
are is wrong

Answer 2

Answer:

Mathematics is my favourite subject.

Explanation:

In this sentence, the verb is in error. It will be is instead of are. This is because the subject mathematics is singular. It is one. Therefore the verb has to be singular to be in agreement with the subject here.  

Only one object is being talked about. Thus is the correct verb used in this sentence. If more than one subject was being talked about here then are would have been appropriate and correct.